import Chuck Cranor's ATM driver

1 files changed, 285 insertions, 0 deletions

diff --git a/sys/netinet/if_atm.c b/sys/netinet/if_atm.c
new file mode 100644
index 0000000..a1daf11
--- /dev/null
+++ b/sys/netinet/if_atm.c
@@ -0,0 +1,285 @@
+/*      $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos Exp $       */
+
+/*
+ *
+ * Copyright (c) 1996 Charles D. Cranor and Washington University.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Charles D. Cranor and 
+ *	Washington University.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * IP <=> ATM address resolution.
+ */
+
+#ifdef INET
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/kernel.h>
+#include <sys/errno.h>
+#if defined(__FreeBSD__)
+#include <sys/sockio.h>
+#else
+#include <sys/ioctl.h>
+#endif
+#include <sys/syslog.h>
+#include <sys/proc.h>
+
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/route.h>
+#include <net/if_atm.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/in_var.h>
+#include <netinet/ip.h>
+#include <netinet/if_atm.h>
+
+#ifdef NATM
+#include <netnatm/natm.h>
+#endif
+
+
+#define SDL(s) ((struct sockaddr_dl *)s)
+
+/*
+ * atm_rtrequest: handle ATM rt request (in support of generic code)
+ *   inputs: "req" = request code
+ *           "rt" = route entry
+ *           "sa" = sockaddr
+ */
+
+void
+atm_rtrequest(req, rt, sa)
+	int req;
+	register struct rtentry *rt;
+	struct sockaddr *sa;
+{
+	register struct sockaddr *gate = rt->rt_gateway;
+	struct atm_pseudoioctl api;
+#ifdef NATM
+	struct sockaddr_in *sin;
+	struct natmpcb *npcb = NULL;
+	struct atm_pseudohdr *aph;
+#endif
+	static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
+
+	if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
+		return;
+
+	switch (req) {
+
+	case RTM_RESOLVE: /* resolve: only happens when cloning */
+		printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
+		break;
+
+	case RTM_ADD:
+
+		/*
+		 * route added by a command (e.g. ifconfig, route, arp...).
+		 *
+		 * first check to see if this is not a host route, in which
+		 * case we are being called via "ifconfig" to set the address.
+		 */
+
+		if ((rt->rt_flags & RTF_HOST) == 0) { 
+			rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
+			gate = rt->rt_gateway;
+			SDL(gate)->sdl_type = rt->rt_ifp->if_type;
+			SDL(gate)->sdl_index = rt->rt_ifp->if_index;
+			break;
+		}
+
+		if ((rt->rt_flags & RTF_CLONING) != 0) {
+			printf("atm_rtrequest: cloning route detected?\n");
+			break;
+		}
+		if (gate->sa_family != AF_LINK ||
+		    gate->sa_len < sizeof(null_sdl)) {
+			log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
+			break;
+		}
+
+#ifdef DIAGNOSTIC
+		if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
+#endif
+
+#ifdef NATM
+		/*
+		 * let native ATM know we are using this VCI/VPI
+		 * (i.e. reserve it)
+		 */
+		sin = (struct sockaddr_in *) rt_key(rt);
+		if (sin->sin_family != AF_INET)
+			goto failed;
+		aph = (struct atm_pseudohdr *) LLADDR(SDL(gate));
+		npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph), 
+						ATM_PH_VPI(aph));
+		if (npcb == NULL) 
+			goto failed;
+		npcb->npcb_flags |= NPCB_IP;
+		npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
+		/* XXX: move npcb to llinfo when ATM ARP is ready */
+		rt->rt_llinfo = (caddr_t) npcb;
+		rt->rt_flags |= RTF_LLINFO;
+#endif
+		/*
+		 * let the lower level know this circuit is active
+		 */
+		bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
+		api.rxhand = NULL;
+		if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA, 
+							(caddr_t)&api) != 0) {
+			printf("atm: couldn't add VC\n");
+			goto failed;
+		}
+
+		SDL(gate)->sdl_type = rt->rt_ifp->if_type;
+		SDL(gate)->sdl_index = rt->rt_ifp->if_index;
+
+		break;
+
+failed:
+#ifdef NATM
+		if (npcb) {
+			npcb_free(npcb, NPCB_DESTROY);
+			rt->rt_llinfo = NULL;
+			rt->rt_flags &= ~RTF_LLINFO;
+		}
+#endif
+		rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0,
+			rt_mask(rt), 0, (struct rtentry **) 0);
+		break;
+
+	case RTM_DELETE:
+
+#ifdef NATM
+		/*
+		 * tell native ATM we are done with this VC
+		 */
+
+		if (rt->rt_flags & RTF_LLINFO) {
+			npcb_free((struct natmpcb *)rt->rt_llinfo, 
+								NPCB_DESTROY);
+			rt->rt_llinfo = NULL;
+			rt->rt_flags &= ~RTF_LLINFO;
+		}
+#endif
+		/*
+		 * tell the lower layer to disable this circuit
+		 */
+
+		bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
+		api.rxhand = NULL;
+		(void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS, 
+							(caddr_t)&api);
+
+		break;
+	}
+}
+
+/*
+ * atmresolve:
+ *   inputs:
+ *     [1] "rt" = the link level route to use (or null if need to look one up)
+ *     [2] "m" = mbuf containing the data to be sent
+ *     [3] "dst" = sockaddr_in (IP) address of dest.
+ *   output:
+ *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
+ *   return: 
+ *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
+ *     1 == resolve OK; desten contains result
+ *
+ *   XXX: will need more work if we wish to support ATMARP in the kernel,
+ *   but this is enough for PVCs entered via the "route" command.
+ */
+
+int
+atmresolve(rt, m, dst, desten)
+
+register struct rtentry *rt;
+struct mbuf *m;
+register struct sockaddr *dst;
+register struct atm_pseudohdr *desten;	/* OUT */
+
+{
+	struct sockaddr_dl *sdl;
+
+	if (m->m_flags & (M_BCAST|M_MCAST)) {
+		log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
+		goto bad;
+	}
+
+	if (rt == NULL) {
+		rt = RTALLOC1(dst, 0);
+		if (rt == NULL) goto bad; /* failed */
+		rt->rt_refcnt--;	/* don't keep LL references */
+		if ((rt->rt_flags & RTF_GATEWAY) != 0 || 
+			(rt->rt_flags & RTF_LLINFO) == 0 ||
+			/* XXX: are we using LLINFO? */
+			rt->rt_gateway->sa_family != AF_LINK) {
+				goto bad;
+		}
+	}
+
+	/*
+	 * note that rt_gateway is a sockaddr_dl which contains the 
+	 * atm_pseudohdr data structure for this route.   we currently
+	 * don't need any rt_llinfo info (but will if we want to support
+	 * ATM ARP [c.f. if_ether.c]).
+	 */
+
+	sdl = SDL(rt->rt_gateway);
+
+	/*
+	 * Check the address family and length is valid, the address
+	 * is resolved; otherwise, try to resolve.
+	 */
+
+
+	if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
+		bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
+		return(1);	/* ok, go for it! */
+	}
+
+	/*
+	 * we got an entry, but it doesn't have valid link address
+	 * info in it (it is prob. the interface route, which has
+	 * sdl_alen == 0).    dump packet.  (fall through to "bad").
+	 */
+
+bad:
+	m_freem(m);
+	return(0);
+}
+#endif /* INET */